RC-BM5
1-17
Cassette amplifier section
Item
Measuring condition
Check and adjustment procedure
Standard value
Adjusting part
Play back the test tape VT702 (8kHz).
Adjust the head azimuth adjusting screw so that the
phase difference between the R and L channels is
minimized at an output level that is within (+2dB-2dB)
of the maximum output level in the FWD and REV
operations. After this adjustment, lock the head
azimuth adjusting screw with screw sealant to cover
more than a half of the screw head.
When the head azimuth is maladjusted, correct it with
the head azimuth adjusting screw in the FWD and
REV operations alternately.
Play back the test tape VT712 (3kHz) by the end
portion.
Connect a frequency counter and check that it reads
between 2940 and 3090Hz. If not, adjust the
frequency with the motor semifixed resistor.
Check that the wow/flutter is within 0.38%
(unweighted).
Play back the test tape VT702 while con-firming that
deviation between the 1kHz signal and 8kHz signal
should be (0+3dB-6dB).
While recording, check to see if the frequency at the
measuring point is (75+2kHz-2kHz) if not adjust T605
until the frequency counter indicates (75+2kHz-2kHz).
In recording FM mode, and record the reference 1kHz
signal and 8kHz signal alternately repeatedly. While
playing back the recorded signal of the 1kHz signal
differ from that of the 8kHz signal by within (0+4dB-
4dB).
Test tape:
VT702 (8kHz)
Signal output terminal:
Speakers
Test tape:
VT712 (3kHz)
Signal output terminal:
Speakers
Test tape: VT702
Signal output terminal:
Speakers
Tape: Normal
Signal output terminal:
Cassette REC./PLAY
HEAD
Test tape: AC225
Signal input:
SG 1kHz -20dBs
with emphasis
Signal output terminal:
Speakers
Head azimuth
adjustment
Tape speed and
wow/flutter check
and adjustment
PB frequency
response check
Bias frequency
check
REC and PB
frequency
response
adjustment
1.
2.
3.
1.
2.
3.
Output level:
Within (+2dB-2dB) of
maximum output
level
Phase difference R
and L channels:
Minimum
2940 to 3090Hz
Within 0.38%
(unweighted)
Deviation between
1kHz and 8kHz:
(0+3dB-6dB)
Level difference for
1kHz singnal: Within
(0+4dB-4dB)
Head azimuth
adjusting screw
(To be used only
after head
replacement)
See Fig.1 on
page 1-18.
Tape speed:
Motor semifixed
resistor
See Fig.2 on
page 1-18.
Check only
T605
See Fig.3 on
page 1-18.
Tuner section
Item
Measuring condition
Check and adjustment procedure
Standard value
Adjusting part
Set the FM signal generator at 108MHz and output
level at 60dBu.
Adjust L102, so that the VT is within (8+0.2V-0.2V).
Set the AM signal generator at 1710kHz and output
level at 100dBu.
Adjust T102, so that the VT is within (8V+0.1V-0.1V).
Set the FM signal generator at 10.7MHz with no
signal deviation and output level at 90dBu.
Short IC101 pin21 to GND.
Adjust T103 so that the voltage between IC101 pin19
and pin20 is within (0+3mV-3mV).
Set the intermediate frequency sweep generator to
AM 450kHz.
Adjust T104 and T105 for maximum and center
output.
Adjust T106 so that the voltage between IC101 pin19
and pin20 is within (0+2mV-2mV).
Signal input:
FM antenna
VT test point:
IC101 pin8
Signal input:
AM loop antenna
VT test point:
IC101 pin8
Signal input:
IC101 pin3
Voltage test point:
IC101 pin19 and pin20
Signal input:
IC101 pin2
Signal output:
IC101 pin10
FM VT
adjustment
AM VT
adjustment
FM IF adjustment
AM IF adjustment
1.
2.
1.
2.
1.
2.
3.
1.
2.
3.
L102
See Fig.4 on
page 1-18.
T102
See Fig.4 on
page 1-18.
T103
See Fig.4 on
page 1-18.
T104
T105
T106
See Fig.4 on
page 1-18.
VT=8+0.2V-0.2V
VT=8+0.1V-0.1V
0+3mV-3mV
Содержание RC-BM5
Страница 41: ...RC BM5 2 1 A B C D E F G 1 2 3 4 5 Block diagram ...
Страница 48: ...RC BM5 2 8 RC BM5 H A B C D E F G 1 2 3 4 5 Printed circuit boards Main board Reverse side ...
Страница 49: ...RC BM5 2 9 A B C 1 2 3 4 5 Tuner board Cassette board Reverse side Reverse side ...
Страница 50: ...RC BM5 2 10 A B C D 1 2 3 4 5 Display board Reverse side Power amplifier board Reverse side ...
Страница 51: ...RC BM5 2 11 A B C 1 2 3 4 5 Volume switch board Reverse side Phone jack board Reverse side ...